<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <div id="app">
        <h2 v-if ="score >= 90">优秀</h2>
        <h2 v-else-if = "score >= 70">良好</h2>
        <h2 v-else-if ="score >= 60">及格</h2>
        <h2 v-else>不及格</h2>

        <h1>{{result}}</h1>
    </div>
    <script src="../js/vue.js"></script>
    <script>
        const app = new Vue({
            el:'#app',
            data:{
                message:'你好呀！',
                score:99
            },
            computed:{
                result(){
                    let showMessage = "";
                    if (this.score >= 90){
                        showMessage = "优秀"
                    }else if (this.score >= 70){
                        showMessage = "良好"
                    }else if (this.score > 60){
                        showMessage = "及格"
                    }else{
                        showMessage = "不及格"
                    }
                    return showMessage
                }
            }
        })
    </script>
</body>
</html>